@article{KYB_1975_11_2_a4,
     author = {Vostr\'y, Zden\v{e}k},
     title = {Discrete twice optimal control systems},
     journal = {Kybernetika},
     pages = {148--163},
     year = {1975},
     volume = {11},
     number = {2},
     mrnumber = {0408918},
     zbl = {0337.49004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1975_11_2_a4/}
}